package com.whl.client.view;


import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.whl.client.R;

import java.text.SimpleDateFormat;
import java.util.Date;


public class ScrollOverListView extends ListView implements OnScrollListener {

    private int mLastY;

    private int mBottomPosition;

    private static final String TAG = "listview";

    private final static int RELEASE_To_REFRESH = 0;
    private final static int PULL_To_REFRESH = 1;
    private final static int REFRESHING = 2;
    private final static int DONE = 3;
    private final static int LOADING = 4;
    private final static int RATIO = 3;

    private LayoutInflater inflater;
    private LinearLayout headView;
    private TextView tipsTextview;
    private TextView lastUpdatedTextView;
    private ImageView arrowImageView;
    private ProgressBar progressBar;
    private RotateAnimation animation;
    private RotateAnimation reverseAnimation;
    private boolean isRecored;
    private int headContentHeight;
    private int startY;
    private int firstItemIndex;
    private int state;

    private boolean isBack;
    public boolean showRefresh = true;

    public static boolean canRefleash = false;

    public ScrollOverListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    public ScrollOverListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public ScrollOverListView(Context context) {
        super(context);
        init(context);
    }

    private void init(Context context) {
        mBottomPosition = 0;
        setCacheColorHint(0);
        inflater = LayoutInflater.from(context);

        headView = (LinearLayout) inflater.inflate(R.layout.pull_down_head, null);
        arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);
        arrowImageView.setMinimumWidth(70);
        arrowImageView.setMinimumHeight(50);
        progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);
        tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
        lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);

        measureView(headView);

        headContentHeight = headView.getMeasuredHeight();

        headView.setPadding(0, -1 * headContentHeight, 0, 0);
        headView.invalidate();

        addHeaderView(headView, null, false);
        setOnScrollListener(this);

        animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        animation.setInterpolator(new LinearInterpolator());
        animation.setDuration(250);
        animation.setFillAfter(true);

        reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);

        reverseAnimation.setInterpolator(new LinearInterpolator());
        reverseAnimation.setDuration(200);
        reverseAnimation.setFillAfter(true);

        state = DONE;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        final int action = ev.getAction();
        final int y = (int) ev.getRawY();
        cancelLongPress();
        switch (action) {
            case MotionEvent.ACTION_DOWN: {  // 按下的时�?
                if (firstItemIndex == 0 && !isRecored) {
                    isRecored = true;
                    startY = (int) ev.getY();
                }
                mLastY = y;
                final boolean isHandled = mOnScrollOverListener.onMotionDown(ev);
                if (isHandled) {
                    mLastY = y;
                    return isHandled;
                }
                break;
            }

            case MotionEvent.ACTION_MOVE: {   // 手指正在移动的时�?
                int tempY = (int) ev.getY();
                if (showRefresh) {

                    if (!isRecored && firstItemIndex == 0) {
                        isRecored = true;
                        startY = tempY;
                    }
                    if (state != REFRESHING && isRecored && state != LOADING) {

                        if (state == RELEASE_To_REFRESH) {

                            setSelection(0);

                            if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) {
                                state = PULL_To_REFRESH;
                                changeHeaderViewByState();

                            } else if (tempY - startY <= 0) {
                                state = DONE;
                                changeHeaderViewByState();

                            } else {
                            }
                        }
                        if (state == PULL_To_REFRESH) {

                            setSelection(0);

                            if ((tempY - startY) / RATIO >= headContentHeight) {
                                state = RELEASE_To_REFRESH;

                                isBack = true;
                                changeHeaderViewByState();

                            } else if (tempY - startY <= 0) {
                                state = DONE;
                                changeHeaderViewByState();

                            }
                        }

                        if (state == DONE) {
                            if (tempY - startY > 0) {
                                state = PULL_To_REFRESH;
                                changeHeaderViewByState();
                            }
                        }

                        if (state == PULL_To_REFRESH) {
                            headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0);
                        }

                        if (state == RELEASE_To_REFRESH) {
                            headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0);
                        }

                    }
                }

                final int childCount = getChildCount();
                if (childCount == 0)
                    return super.onTouchEvent(ev);
                final int itemCount = getAdapter().getCount() - mBottomPosition;
                final int deltaY = y - mLastY;
                final int lastBottom = getChildAt(childCount - 1).getBottom();
                final int end = getHeight() - getPaddingBottom();

                final int firstVisiblePosition = getFirstVisiblePosition();

                final boolean isHandleMotionMove = mOnScrollOverListener.onMotionMove(ev, deltaY);

                if (isHandleMotionMove) {
                    mLastY = y;
                    return true;
                }

                if (firstVisiblePosition + childCount >= itemCount && lastBottom <= end && deltaY < 0) {
                    final boolean isHandleOnListViewBottomAndPullDown;
                    isHandleOnListViewBottomAndPullDown = mOnScrollOverListener.onListViewBottomAndPullUp(deltaY);
                    if (isHandleOnListViewBottomAndPullDown) {
                        mLastY = y;
                        return true;
                    }
                }
                break;
            }

            case MotionEvent.ACTION_UP: {   // 手指抬起来的时�??
                if (state != REFRESHING && state != LOADING) {
                    if (state == DONE) {
                    }
                    if (state == PULL_To_REFRESH) {
                        state = DONE;
                        changeHeaderViewByState();

                    }

                    if (state == RELEASE_To_REFRESH) {
                        state = REFRESHING;
                        changeHeaderViewByState();

                        canRefleash = true;

                    }
                }

                isRecored = false;
                isBack = false;

                final boolean isHandlerMotionUp = mOnScrollOverListener.onMotionUp(ev);
                if (isHandlerMotionUp) {
                    mLastY = y;
                    return true;
                }
                break;
            }
            case MotionEvent.ACTION_CANCEL:
                state = DONE;
                changeHeaderViewByState();
                break;
        }
        mLastY = y;
        return super.onTouchEvent(ev);
    }

    private OnScrollOverListener mOnScrollOverListener = new OnScrollOverListener() {

        @Override
        public boolean onListViewTopAndPullDown(int delta) {
            return false;
        }

        @Override
        public boolean onListViewBottomAndPullUp(int delta) {
            return false;
        }

        @Override
        public boolean onMotionDown(MotionEvent ev) {
            return false;
        }

        @Override
        public boolean onMotionMove(MotionEvent ev, int delta) {
            return false;
        }

        @Override
        public boolean onMotionUp(MotionEvent ev) {
            return false;
        }

    };

    public void setTopPosition(int index) {
        if (getAdapter() == null)
            throw new NullPointerException("You must set adapter before setTopPosition!");
        if (index < 0)
            throw new IllegalArgumentException("Top position must > 0");
    }

    public void setBottomPosition(int index) {
        if (getAdapter() == null)
            throw new NullPointerException("You must set adapter before setBottonPosition!");
        if (index < 0)
            throw new IllegalArgumentException("Bottom position must > 0");

        mBottomPosition = index;
    }

    public void setOnScrollOverListener(OnScrollOverListener onScrollOverListener) {
        mOnScrollOverListener = onScrollOverListener;
    }

    public interface OnScrollOverListener {

        boolean onListViewTopAndPullDown(int delta);

        boolean onListViewBottomAndPullUp(int delta);

        boolean onMotionDown(MotionEvent ev);

        boolean onMotionMove(MotionEvent ev, int delta);

        boolean onMotionUp(MotionEvent ev);

    }

    @Override
    public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2, int arg3) {
        firstItemIndex = firstVisiableItem;

    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    private void measureView(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        if (p == null) {
            p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        }
        int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
        int lpHeight = p.height;
        int childHeightSpec;
        if (lpHeight > 0) {
            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
        } else {
            childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        }
        child.measure(childWidthSpec, childHeightSpec);
    }

    public void onRefreshComplete() {
        state = DONE;
        SimpleDateFormat sfd = new SimpleDateFormat("MM-dd kk:mm");
        lastUpdatedTextView.setText(getContext().getResources().getString(R.string.updated_at) + sfd.format(new Date()));
        changeHeaderViewByState();
    }

    private void changeHeaderViewByState() {
        switch (state) {
            case RELEASE_To_REFRESH:
                arrowImageView.setVisibility(View.VISIBLE);
                progressBar.setVisibility(View.GONE);
                tipsTextview.setVisibility(View.VISIBLE);
                lastUpdatedTextView.setVisibility(View.VISIBLE);

                arrowImageView.clearAnimation();
                arrowImageView.startAnimation(animation);

                tipsTextview.setText(R.string.released_updated);

                break;
            case PULL_To_REFRESH:
                progressBar.setVisibility(View.GONE);
                tipsTextview.setVisibility(View.VISIBLE);
                lastUpdatedTextView.setVisibility(View.VISIBLE);
                arrowImageView.clearAnimation();
                arrowImageView.setVisibility(View.VISIBLE);
                if (isBack) {
                    isBack = false;
                    arrowImageView.clearAnimation();
                    arrowImageView.startAnimation(reverseAnimation);

                    tipsTextview.setText(R.string.pulldown_update);
                } else {
                    tipsTextview.setText(R.string.pulldown_update);
                }
                break;

            case REFRESHING:

                headView.setPadding(0, 0, 0, 0);
                progressBar.setVisibility(View.VISIBLE);
                arrowImageView.clearAnimation();
                arrowImageView.setVisibility(View.GONE);
                tipsTextview.setText(R.string.pulldown_loading);
                lastUpdatedTextView.setVisibility(View.VISIBLE);

                break;
            case DONE:
                headView.setPadding(0, -1 * headContentHeight, 0, 0);
                progressBar.setVisibility(View.GONE);
                arrowImageView.clearAnimation();
                arrowImageView.setImageResource(R.drawable.ic_list_rf);
                tipsTextview.setText(R.string.pulldown_update);
                lastUpdatedTextView.setVisibility(View.VISIBLE);
                break;
        }
    }
}
